It depends.: If you're able to start the Pill within the first 7 days of your cycle (day 1=first day of period) you will NOT need a back up form of contraception. Otherwise, you need to be on the Pill for at least 7 days before you can rely on the Pill alone.. At age 17, you may not be ready to deal with an unplanned pregnancy, so please be extra careful.
Answered 6/23/2015
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